unplummetable

== English == === Etymology === From un- +‎ plummet +‎ -able. === Adjective === unplummetable (not comparable) unable to be fathomed 2004: Immeasurable and unplummetable fathoms / too deep for sounding or for any anchor — Derek Walcott, The Prodigal, (Farrar, Straus and Giroux, 2004) page 102.